A common law trust



Jan. 29, 1924. 1,481,959

R. W. FRENCH RADIO APFAMTUS Filed March 27. 1922 Imm mu MMT@ 1v'in which.` the layerso wire Patented Jan. 29, 1924.

UNITED STATES PATENT OFFICE.

nENssnLAnR w. FRENCH, or CHICAGO, ILLINOIS, AssIGNon, BY Mnsnn ASSIGNMENTS, To DIAMOND Immo PRODUCTS, or CHICAGO, ILLINOIS, Common LAW TRUST.

I LIIDIOAPIABATUS.

' Application filed Maren e?, 1922. serial No. 547,364.

To all whom 'it may concern:

Be it known that I RnNssEnAnn' FRENCH, a citizen of the a resident of Chicago, in the county of Cook` and State of Illinois, have nvented a new and useful Improvement in Radio Appara" tus, of which the following is a full','clear, and exact description. f

My invention relates to'improvements in' radio apparatus, and it consistslinithe'fcomi l itorcoil is more'clearly shown in the dm# lgramniatic Fig'. 5'.l -This winding Consists binations, constructions and'- arrangements herein described and claimed."

An' object of my invention 'a device of the characterldes'c V positive electricalconnections established betweenthe stator coil `and 'the1A movable rotoI coiLiI" '2"' is to i provide A. furtheiq objectA or my' --inpfention iisu rovide a variometer .L' further object-- of'finy :Inventiow t'wf provide -a device .of-the charaeterdescribedfon!` the :primary fare in; 'closelregistration ither'rotor, thus" or stator winding 4wire upon with" the layers o increasing the in device. 4 'I l A=.further object ofirny invention providevadevice of the charadterfrdesc'ibedwhich .is extremely simple' in; construction,- which. is durable, andi' whiclfs 'i'.hro'ughlypractical for the purposeintended-I.1'E3i il Other objects and advantages. vvllflappe'ar in the'. following specification; andth'e novel 'nted States, and

layer 'of the lattice Winding used On the lstatorl and rotor coils.

In carrying'out my invent-ion, I make use of a stator base member 1 having an arcuate upper surface 2. An annular shell 3 having a lattice Wound stator coil 4 wound thereupon is supported upon"the base member 1, a portion 'of the Shell 3 being concentric the arcuate surface 2.

The' lattice winding employed in the sta.-

oneourth jo an "inch, thus producing a lat- 'tice-likefwindng: The next layer of turns` l t Ewillf'b'e-exactly concentric: the first layer, andvaliol-co ler hav-If-ithusreducin'gtlie- 'capacity effect between g`a"-'S1 1}f 'e1'p`bleed' -layer'sto a' minimum. A rotor 'consisting o fan annular shell 6 9f' 'bakelite Vor 'other similar "insulating compondfand ai lattice' winding 7 carried thereupon is'rotatably supported within the statlp'r shelli3` and exactly concentric there- Wit A.;

'-'5 iS rovded'infa pair of cross supporting -mem ers'f'fsecuredtoithe inner surface of the-rotor shell 6." Stub shafts 9 are secured f .toV the' supporting membersfS' by means of ltedlto hold the supportingr lmembers 8 t erebetweenuplon a threaded {fpojltion- 11 of the shaft 9. "T e opposite ends "12 of "thet shafts '9 "are arranged to" extend "ithrough the'jrotor'5, as shown at 13', the

'' stator shell= 3, and the statorwnding-4 and `ent-endrtherebeyond.

i The' extended-portions 12 of the-shaft 9 features Off-'ther invention; willff'be" articli'"`on"`thefilat uppers'urfacesl' of the basel.

larg/E' pointed out in the'a'ppeded A)ri-invention isillustrated in the-'accomplication, -in whichw Fig.` l'zisa side elevation of anietmlbod" Fig. 5 is a diagrammatic showing of one panying-V drawings, forming part ofthis 'ap-F- Bearin'g meinbsli forming a portion of a. I single' vbearing plate'117 are arranged -to en! gage the'portionsf 120i the shaft 9 to revent'lateral inoveme'nt 'of the shaft anc to 'rovide a beari I'th 1=,11 af ':r, thev plates 17 rEe surfaces 15 by means oi ing'secured to screws,A 18.1 l I Theplates'l' are each provided With -rabbeted portions 19 on each side of the o ening 20, which opening is formed in the p ate 17 because of the spacing apart of the bearing members 16. An annular collar 21 is disposed upon the shaft 9 intermediate the of the Coil '4' approximately 'are received in 'sliallcvr arcuate grooves 11' 'so Means foirotatably supporting the rotor loo , xjariometer and sharpen tuningimay) adjacent sides of the bearing portions 16 and a set screw 22 in cach of, thencolliars 2t provides. melsf fdrl fixing the. collars 21 against movementrelative to the shafts' It will be readily apparent that if either of`the shafts 9 istrned, that the rotor' will turn thereW-ithfas well as -the collars 21 on each of the shafts 9, and that in turning, the screws 22 will ultimately move iiito contact with the rabbeted. portions 19 of tlie plate- 17 to stop the rotating of the shafts 9 andthe rotor 5` l I thus proyiden adjusts 4able means (since the collar,12- may be moved longitudinally. or turned) for confining. the oscillation of the rotor 5 to exactly 180. This construction is most clearly 4shown in I ig. 4. The electrical connections .latingicement1 and; thus ,.reduce .f materially ,one

turned relative to one another in such a manner n s to limit the oscillation of the rotr to 180 (ordinarily 180 is desirable for efficient tuning).

Byshifting thecollars]` 21 laterally upon t'liesliafts 9,11, causlclithe collarsltofrictionally engage'th'e adjacent' sides'29 of'tlic receSSeS 30 in the base 1 provided to admit the itati'ono'f the collars. This frictional engagement serves asa drag for the rotor and may b varied at will. y

In using my device as a vario-coupler,I do noti connect the `rotor and stator` coilsr in series, but insteadg'I provide four binding; posts, twoof which are connected to opposite terminals of the stator winding andthe i. remaining two are connected to the' opposite terminals of the rotor,A winding.

It should be understood that whileI have here shownand described a device in which the stator coil 4. is wound upon a shell- 3'v of .an insulatinginaterialtliat the shell may: .be dispensed with'and-,thestatorcoil-4 maybe. selfl supporting .Iby use of a suitable', insu thecostofgmaliilfiacturing.tlie'deyicei i Iiidisposing iwiththe shellw 3,.-which is ordinarily constructed with bakeliteolrrot-her: 1 insulating-.,millrialMl do awayf-withthe ci- `an =aiinulan ,lattice woundistator 'coil of'ifI-isuA f presence-oi anelectrie'circuit." '1

I claim: 1.- In a device offl the? character-described,

lated. rwireaan -annularnlaittid'e Wound==ro`to coil of insulated wire rotatably .nio'unted' Within' said stator \.-andarranged' to be From: the. foregoingf'fdescriptionf pfgtlie fmqved-iconoentiictherewith,.,ech. wmf-mfp,

Vvarious I .par-ts of thai de igicef-.tlid operation' thereo-f,ma.y;.be -readilyi understood In. msn. g ing mydevice.as=avariometep, 1 connect -thebinding-posts '23 and.281in precisely thessame said-m0171117 rcoilnbein'g/ arranged tofekactily :100

underlie site?, correspondinlgffl .tum '.-fon said: stator: coilA when -..Sa1d -cis' are.concex'itrie'A -withioiie another.i

manner-,that the ordinarytype owarometerm; 2. Ina device of the character describedgf.

is .,connected.: -My'.'device;however,` Ais fa-r more eliicient. than thef ordinary, type of i @.343- l com-plishedjbecauseul. liavenredu'ced f theVY capacity effect in the staten-rand.irotorigivind-i ing by.4 the em ployinent of. the lattifwind im' Shownin Fig-1 Thidvlce is-ffulthenu- .cliiciend inasmuch asqtli'ei Station ,windzllgliS 1 disposed. so that itsindividuaL turns mrefexfi actly concentric with. corresppndingfiturns' upon zthe rotor 55 thus greatly.:increas.ing'gtlie-` inductive efliciency betyveenintlie adjaeenb tentV of. oscillation Lo;f`- the .rotor 5:y Aisrposif; tively determined by means of the collars-21` and set screws-'29s.. The-col1arsf21-Hwllbe having aliasend a rotor, a -pfair ofdanieh m5 rically-g opposed bearingi inlemlirslzmoiiiited"4 on saldi ibaegr pair-of-stubfshats'monted i one ein; eachl of Esaidffliea'ring.i'nembers,`l said? rotor being'slpportedzon-ther-adjacentaeiids-il of said; shafts; and .arranged for laterale r rotary;` adjustment thereonfandi setscrewsr for locking saidncollars; against 'movement of said-shaft at will-,userid 'set screwsfbeingl arrangedit e age Said: baringmembers' to :U5 limit the rotation of said` rtigsaid collarsV being.. adapted'- .to frictiomill'y aengage' said base to drag against the:,rotationrolfI-sad;V

rotor: 

